Occlusion type expansion sleeve

Abstract

The utility model discloses an occlusion type expansion sleeve which comprises a cylindrical sleeve body formed by rolling a plate body, the upper portion of the sleeve body is provided with a long-strip-shaped notch penetrating through the top of the sleeve body, and the upper portion of the sleeve body is divided into a plurality of expansion parts through the long-strip-shaped notch. When the sleeve body is unfolded into a plate body, a first meshing tooth part and a second meshing tooth part are arranged on the two sides of the lower portion of the sleeve body respectively. When the plate body is rolled into the sleeve body, the first meshing tooth part and the second meshing tooth part are meshed and clamped; and barbs and stamping grooves are arranged on the sleeve body. By arranging the first meshing tooth part and the second meshing tooth part, the structural strength of the splicing position of the sleeve body can be improved, and the cracking risk of the splicing position of the sleeve body is reduced; by arranging the barbs, the friction force between the sleeve body and the mounting hole can be increased, the sleeve body is prevented from idling, meanwhile, the barbs can prevent the sleeve body from being separated from the mounting hole, and the fixing effect of the sleeve body is improved; and by forming the stamping groove, the structural strength of the expansion part can be improved, and the structural strength of the sleeve body can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion sleeves, in particular to a bite-type expansion sleeve. Background Art

[0002] Expansion bolts are special threaded connectors used to fix on walls, floors and columns. They are generally composed of bolts, expansion sleeves and nuts. The bolts pass through the expansion sleeves and then insert into the nuts. There is a conical head at the end of the bolt. When the nut is tightened, the conical head pushes the expansion sleeve outward to achieve the purpose of expansion, thereby fixing the bolt.

[0003] Existing expansion sleeves, such as the patent with publication number CN214404264U, discloses an expansion bolt with a large expansion amount, including an expansion screw and an expansion sleeve. The expansion sleeve is cylindrical and is made of an iron plate by shearing, stamping and rolling. The left side of the expansion sleeve is symmetrically punched with three short cuts, which divide the left side of the expansion sleeve into three petals.

[0004] The expansion sleeve is made of iron plates through shearing, stamping and rolling. There are gaps at the joints of the rolled iron plates, and the connection strength is relatively low. The cylindrical shape of the expansion sleeve is maintained only by its own plastic strength. When the bolt squeezes the expansion sleeve, it is easy to crack. Utility Model Content

[0005] Based on this, it is necessary to provide a bite-type expansion casing to address the above technical problems.

[0006] In order to achieve the above-mentioned purpose, the utility model provides an interlocking expansion sleeve, including a sleeve body rolled into a cylindrical shape by a plate body, the upper part of the sleeve body is provided with a long notch running through the top thereof, the long notch divides the upper part of the sleeve body into a plurality of expansion parts, and when the sleeve body is unfolded into a plate body, a first interlocking tooth portion and a second interlocking tooth portion are respectively provided on both sides of its lower part; when the plate body is rolled into the sleeve body, the first interlocking tooth portion is interlocked and clamped with the second interlocking tooth portion.

[0007] Preferably, the number of the long notches is two, and the two long notches divide the upper portion of the sleeve body into three expansion portions.

[0008] Preferably, the lower portion of the sleeve body is provided with at least two barbs, and the barbs are evenly distributed on the sleeve body.

[0009] Preferably, the sleeve body is provided with punching holes corresponding to the barbs.

[0010] Preferably, the sleeve body is provided with a first cutout corresponding to the long notch one by one, and the upper end of the first cutout is connected to the lower end of the long notch.

[0011] Preferably, when the sleeve body is unfolded into a plate body, a second incision and a third incision are respectively provided on both sides of its lower part, the second incision is located above the first engaging tooth portion, and the third incision is located above the second engaging tooth portion, and the upper ends of the second incision and the third incision are both flush with the upper end of the first incision.

[0012] Preferably, the first incision is in the shape of a regular hexagon, circle, ellipse, triangle or rectangle; when the plate body is rolled into the sleeve body, the second incision and the third incision are spliced ​​into a regular hexagon, circle, ellipse, triangle or rectangle.

[0013] Preferably, the first meshing tooth portion and the second meshing tooth portion both include a plurality of dovetail-shaped meshing teeth.

[0014] Preferably, a stamping groove is provided on the sleeve body.

[0015] Preferably, the stamping groove corresponds to the expansion part one by one, and a part of the stamping groove is located on the corresponding expansion part.

[0016] The beneficial effects of the technical solution are as follows: by providing the first meshing tooth portion and the second meshing tooth portion, a mortise and tenon structure can be formed at the splicing of the casing body, thereby increasing the structural strength of the splicing of the casing body and reducing the risk of cracking at the splicing of the casing body;

[0017] By providing the barbs, after the sleeve body is inserted into the mounting hole, the barbs directly contact the inner wall of the mounting hole, which can increase the friction between the sleeve body and the mounting hole, and avoid the sleeve body from idling when the screw is turned; when the sleeve body is pulled out, the barbs press against the hole wall of the mounting hole, preventing the sleeve body from being separated from the mounting hole, and improving the fixing effect of the sleeve body;

[0018] By providing the stamping groove, the structural strength of the expansion part can be improved, and the structural strength of the sleeve body can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of a bite-type expansion sleeve according to an embodiment of the utility model;

[0020] Figure 2 It is a rear view of a bite-type expansion sleeve according to an embodiment of the utility model;

[0021] Figure 3 A top view of a bite-type expansion sleeve according to an embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the deployment of a bite-type expansion sleeve according to an embodiment of the utility model;

[0023] In the figure, 1, sleeve body; 2, long notch; 3, expansion portion; 4, first engaging tooth portion; 5, second engaging tooth portion; 6, barb; 7, punching hole; 8, first incision; 9, second incision; 10, third incision; 11, stamping groove. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0025] See also Figures 1 to 4 The embodiment of the present application provides a bite-type expansion casing, comprising a casing body 1 rolled into a cylindrical shape by a plate body, the plate body is a steel plate, and the upper part of the plate body is provided with a long notch 2 running through the top thereof; in the present embodiment, two long notches 2 are provided, and the two long notches 2 divide the upper part of the casing body 1 into three expansion parts 3. In other embodiments, the long notches 2 can also be provided with three to eight, and the number of expansion parts 3 formed is one more than the number of long notches 2; when the plate body is rolled into the casing body 1, the expansion part 3 is in the shape of an arc plate;

[0026] The first engaging tooth portion 4 and the second engaging tooth portion 5 are provided on both sides of the lower part of the plate body; when the plate body is rolled into the sleeve body 1, the first engaging tooth portion 4 and the second engaging tooth portion 5 are engaged and clamped. In this embodiment, the first engaging tooth portion 4 and the second engaging tooth portion 5 both include a plurality of engaging teeth in the shape of a dovetail. In other embodiments, the engaging teeth may also be T-shaped or other shapes that can achieve engagement and clamping.

[0027] The expansion sleeve is used in conjunction with bolts and nuts to form an expansion bolt.

[0028] By processing the long notch 2, the first bite tooth portion 4 and the second bite tooth portion 5 on the plate body, and then rolling the plate body, when the rolling is completed, the first bite tooth portion 4 automatically bites with the second bite tooth portion 5 to achieve a snap connection. The first bite tooth portion 4 and the second bite tooth portion 5 form a mortise and tenon structure to increase the structural strength of the splicing of the sleeve body 1. When the bolt squeezes the sleeve body 1, the first bite tooth portion 4 and the second bite tooth portion 5 bite together to prevent the splicing of the sleeve body 1 from cracking.

[0029] In a preferred embodiment, in order to increase the friction between the sleeve body 1 and the mounting hole after the sleeve body 1 is inserted into the mounting hole, please refer to Figures 1 to 4, two barbs 6 are arranged at the lower part of the sleeve body 1, and the barbs 6 are evenly distributed on the sleeve body 1; in other embodiments, the number of barbs 6 can also be set to three or more. By arranging the barbs 6, after the sleeve body 1 is inserted into the mounting hole, the barbs 6 directly contact the inner wall of the mounting hole, which can increase the friction between the sleeve body 1 and the mounting hole, and avoid the sleeve body 1 from idling when the screw is turned; when the sleeve body 1 is pulled out, the barbs 6 press against the hole wall of the mounting hole to prevent the sleeve body 1 from being separated from the mounting hole, thereby improving the fixing effect of the sleeve body 1.

[0030] See also Figure 4 The sleeve body 1 is provided with a punching hole 7 corresponding to the barb 6. The barb 6 and the opening are formed by stamping on the plate body. The barb 6 is the part lost by the opening. The barb 6 is triangular in shape, and the tip of the barb 6 faces the lower end of the sleeve body 1. The end of the barb 6 away from the tip is integrally connected to the sleeve body 1.

[0031] In a preferred embodiment, in order to enable the expansion portion 3 to be smoothly squeezed and expanded outward, please refer to Figure 1 and Figure 4 A first cutout 8 corresponding to the long notch 2 is provided on the sleeve body 1 , and the upper end of the first cutout 8 is connected to the lower end of the long notch 2 .

[0032] When the sleeve body 1 is unfolded into a plate body, a second incision 9 and a third incision 10 are respectively provided on both sides of its lower part. The second incision 9 is located above the first engaging tooth portion 4, and the third incision 10 is located above the second engaging tooth portion 5. The upper ends of the second incision 9 and the third incision 10 are both flush with the upper end of the first incision 8.

[0033] The first cutout 8 is in the shape of a regular hexagon, a circle, an ellipse, a triangle or a rectangle; when the plate body is rolled into the sleeve body 1, the second cutout 9 and the third cutout 10 are spliced ​​into a regular hexagon, a circle, an ellipse, a triangle or a rectangle. In this embodiment, the first cutout 8 is set to be in the shape of a regular hexagon, and when the plate body is rolled into the sleeve body 1, the second cutout 9 and the third cutout 10 are spliced ​​into a regular hexagon.

[0034] The arrangement of the first incision 8, the second incision 9 and the third incision 10 can make the first incision 8, the second incision 9 and the third incision 10, that is, the end of the expansion part 3, bend more easily, so as to facilitate the expansion part 3 to expand outward.

[0035] In a preferred embodiment, in order to improve the strength of the sleeve body 1, please refer to Figures 1 to 4, a stamping groove 11 is provided on the sleeve body 1. The stamping groove 11 corresponds to the expansion part 3 one by one, and a part of the stamping groove 11 is located on the corresponding expansion part 3. The stamping groove 11 is formed by stamping, and the stamping groove 11 is concave inward on the outer wall of the sleeve body 1 and convex inward on the inner wall of the sleeve body 1; the stamping groove 11 can improve the structural strength of the expansion part 3.

[0036] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A bite-type expansion casing, comprising a casing body (1) formed by rolling a plate into a cylindrical shape, characterized in that: The upper portion of the sleeve body (1) is provided with a long notch (2) penetrating the top thereof, the long notch (2) dividing the upper portion of the sleeve body (1) into a plurality of expansion portions (3), and when the sleeve body (1) is unfolded into a plate body, a first meshing tooth portion (4) and a second meshing tooth portion (5) are respectively provided on both sides of the lower portion thereof; when the plate body is rolled into the sleeve body (1), the first meshing tooth portion (4) and the second meshing tooth portion (5) are meshed and engaged.

2. The bite-type expansion sleeve according to claim 1, characterized in that: The long strip notches (2) are arranged in two, and the two long strip notches (2) divide the upper portion of the sleeve body (1) into three expansion portions (3).

3. The bite-type expansion sleeve according to claim 1, characterized in that: The lower part of the sleeve body (1) is provided with at least two barbs (6), and the barbs (6) are evenly distributed on the sleeve body (1).

4. The bite-type expansion sleeve according to claim 3, characterized in that: The sleeve body (1) is provided with a punching hole (7) corresponding to the barb (6).

5. The bite-type expansion sleeve according to claim 1, characterized in that: The sleeve body (1) is provided with a first cutout (8) corresponding one-to-one to the long notch (2), and the upper end of the first cutout (8) is connected to the lower end of the long notch (2).

6. The bite-type expansion sleeve according to claim 5, characterized in that: When the sleeve body (1) is unfolded into a plate body, a second cutout (9) and a third cutout (10) are respectively provided on both sides of the lower part thereof, the second cutout (9) is located above the first engaging tooth portion (4), the third cutout (10) is located above the second engaging tooth portion (5), and the upper ends of the second cutout (9) and the third cutout (10) are both flush with the upper end of the first cutout (8).

7. The bite-type expansion sleeve according to claim 6, characterized in that: The first cutout (8) is in the shape of a regular hexagon, circle, ellipse, triangle or rectangle; when the plate body is rolled into the sleeve body (1), the second cutout (9) and the third cutout (10) are spliced ​​into a regular hexagon, circle, ellipse, triangle or rectangle.

8. The bite-type expansion casing according to claim 1, characterized in that: The first engaging tooth portion (4) and the second engaging tooth portion (5) both comprise a plurality of dovetail-shaped engaging teeth.

9. The bite-type expansion sleeve according to any one of claims 1 to 8, characterized in that: The sleeve body (1) is provided with a stamping groove (11).

10. The bite-type expansion sleeve according to claim 9, characterized in that: The stamping groove (11) corresponds one to one with the expansion portion (3), and a portion of the stamping groove (11) is located on the corresponding expansion portion (3).

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